Fan hood structure and fan

Abstract

To provide a fan hood structure and a fan having the fan hood structure, which can diffuse air in a non-axial direction and improve a user experience. [Solution] The fan hood structure includes a front grille (100) and a rear grille (200), the rear grille having a first mounting opening (201), the front grille detachably attached to the first mounting opening, and two opposing sides of the front grille selectively facing the rear grille, the front grille having a plurality of air ducts (101) spaced apart on the same circumference, the airflow direction at one end opening of the air ducts being parallel to the central axis of the first mounting opening, and the airflow direction at the other end opening of the air ducts intersecting the central axis of the first mounting opening. The fan hood structure of this invention breaks the limitation of airflow direction being limited to linear axial blowing and offers a variety of air blowing methods.

Description

[Technical Field]

[0001] The present invention relates to the field of fan technology, and more particularly to a fan hood structure and a fan. [Background technology]

[0002] In the fan structure, the fan hood structure is a blowing structure, which usually includes a front grille and a rear grille that are detachably connected. When the fan is operating, the blades in the fan hood structure are rotated by the motor, and the airflow first enters the fan hood structure through the rear grille and then is sent out through the front grille to achieve blowing. However, due to the structural constraints of the front grille's linear duct, the fan hood structure is usually limited to axial linear blowing, which results in a single blowing method and affects the user experience. Summary of the Invention [Problem to be solved by the invention]

[0003] To solve the above problems, the present invention provides a fan hood structure and a fan. [Means for solving the problem]

[0004] According to a first aspect, the present invention provides a fan hood structure, comprising a front grille and a rear grille, the rear grille having a first mounting opening, the front grille being adapted to be detachably mounted to the first mounting opening, and opposite sides of the front grille selectively facing the rear grille, the front grille being provided with a plurality of air ducts penetrating both opposite sides thereof, the plurality of air ducts being spaced apart within the same circumference, the air flow direction at one end opening of the air duct along the central axis of the first mounting opening being parallel to the central axis of the first mounting opening, and the air flow direction at the other end opening of the air duct intersecting the central axis of the first mounting opening.

[0005] Optionally, at least a portion of the front grille is located within the first mounting opening and is removably connected to the rear grille; Alternatively, the front grille includes an outer frame, and a second mounting opening and a third mounting opening are provided at both ends of the outer frame along its axial direction, respectively, and the portion of the rear grille provided with the first mounting opening is inserted into the second mounting opening or the third mounting opening of the front grille and is removably connected to the rear grille.

[0006] Optionally, the fan hood structure further includes a first connecting structure and a second connecting structure, the first connecting structure being provided on the periphery of the front grille and the second connecting structure being provided on the periphery of the rear grille, the first connecting structure and the second connecting structure being used for rotational engagement, thereby connecting the front grille and the rear grille.

[0007] Optionally, the front grille and the rear grille are connected by a plurality of sets of the first connecting structures and the second connecting structures, and the plurality of sets of the first connecting structures and the second connecting structures are uniformly distributed.

[0008] Optionally, when at least a portion of the front grille is located within the first mounting opening and is removably connected to the rear grille, an outer shape of the front grille is circular; The first connecting structure is a first fixing groove provided on the circumferential side wall of the front grille, the first fixing groove including a first groove unit and a second groove unit, the first groove unit extending along the thickness direction of the front grille, one end of the second groove unit communicating with the first groove unit and the other end extending along the circumferential direction of the front grille, the second connecting structure is a first protrusion provided on the inner wall of the first mounting opening, the first protrusion passing through the first groove unit to reach the connecting point between the first groove unit and the second groove unit, and is used to engage into the second groove unit when the front grille and the rear grille rotate relative to each other.

[0009] Optionally, when a portion of the rear grille provided with the first mounting opening is inserted into the second mounting opening or the third mounting opening of the front grille and is detachably connected to the rear grille, an outer shape of the portion of the rear grille provided with the first mounting opening is circular; The first connecting structure is a second protrusion provided on the inner wall of the second mounting hole or the third mounting hole, and the second connecting structure is a second fixing groove provided on the circumferential side wall of the rear grille, the second fixing groove including a third groove unit and a fourth groove unit, the third groove unit extending along the central axis direction of the first mounting hole, one end of the third groove unit extending to the edge of the first mounting hole, one end of the fourth groove unit communicating with the third groove unit and the other end extending along the circumferential direction of the circumferential side wall of the rear grille, the second protrusion passing through the third groove unit to reach the communicating point between the third groove unit and the fourth groove unit, and being used to engage into the fourth groove unit when the front grille and the rear grille rotate relative to each other.

[0010] Optionally, one end of the air duct is a straight duct section, the air flow movement direction of the straight duct section is parallel to the central axis direction of the first mounting port, and the other end of the air duct is an arc-shaped duct section or an inclined duct section provided at an angle to the straight duct section, the air flow movement direction of the arc-shaped duct section and the inclined duct section intersects with the central axis direction of the first mounting port.

[0011] Optionally, the front grille includes a plurality of partition plates distributed at intervals within the same circumference, and the air duct is formed between two adjacent partition plates, and the partition plates include a first plate member and a second plate member connected along the central axis direction of the first mounting port, and the first plate member is a straight plate, and the second plate member is an arc-shaped plate or a straight plate arranged to form an included angle with the first plate member.

[0012] Optionally, the front grille is provided with a plurality of circumferential storage spaces along the radial direction, and each of the circumferential storage spaces has a plurality of the air ducts distributed at intervals along the same circumference.

[0013] According to a second aspect, the present invention provides a fan including a fan hood structure as described above. [Effects of the Invention]

[0014] Compared with the related art, the beneficial effects of the present invention are as follows: The front grille of the fan hood structure is detachably attached to the first mounting port, and the opposing sides of the front grille can be selectively directed toward the rear grille; that is, the front grille can be attached to both sides and can be attached and detached regardless of the mounting direction. Secondly, the front grille's multiple air ducts are spaced apart on the same circumference, and the airflow movement direction at one end opening of the air duct is parallel to the central axis of the first mounting port. Therefore, when the end opening is located in front of the grille structure, the grille structure can blow air in a straight line in the axial direction. However, the airflow movement direction at the other end outlet of the air duct intersects the central axis of the first mounting port. Therefore, when the end opening is located in front of the grille structure, the grille structure can blow air in a diffusive direction in a non-axial direction. In summary, the fan hood structure of the present invention breaks through the limitation of front grilles in the related art that are limited to axial straight-line airflow, thereby enriching the air blowing methods and further improving the user experience. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of an explosion of a fan hood structure according to an embodiment of the present invention. [Figure 2] 1 shows a fan blowing method according to an embodiment of the present invention. [Figure 3] 3 shows another blowing method of the fan in accordance with an embodiment of the present invention. [Figure 4] 2 is a schematic diagram showing an explosion of the fan hood structure according to the embodiment of the present invention; [Figure 5]2 is a structural schematic diagram of a fan hood structure according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention clearer and easier to understand, the following detailed description of specific embodiments of the present invention will be given with reference to the drawings. Although the drawings show several embodiments of the present invention, it should be understood that the present invention can be realized in various forms and should not be construed as being limited to the embodiments described herein, but rather, these embodiments are provided for a deeper and more complete understanding of the present invention.

[0017] As used herein, the term "comprises" and its variations are open inclusive, i.e., "including but not limited to," and the term "optionally" refers to "an optional embodiment." Definitions of other terms are provided in the following description. Note that the concepts of "first," "second," etc., referred to in the present invention are used only to distinguish between different devices, modules, or units, and do not limit the order or interdependence of the functions performed by these devices, modules, or units.

[0018] In describing the present invention, it should be understood that the orientations or positional relationships indicated by the terms "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," etc. are based on the orientations or positional relationships shown in the drawings, and are intended solely to facilitate the explanation and simplification of the present invention, and do not indicate or suggest that the indicated devices or elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be understood as limitations on the present invention.

[0019] The fan hood structure of an embodiment of the present invention includes a front grille 100 and a rear grille 200, the rear grille 200 having a first mounting opening 201, the front grille 100 being adapted to be detachably mounted to the first mounting opening 201, and opposite sides of the front grille 100 selectively facing the rear grille 200. The front grille 100 is provided with a plurality of air ducts 101 penetrating its opposite sides, the plurality of air ducts 101 being spaced apart within the same circumference, the air flow direction at the opening at one end of the air duct 101 along the central axis of the first mounting opening 201 being parallel to the central axis of the first mounting opening 201, and the air flow direction at the opening at the other end of the air duct 101 being intersecting the central axis of the first mounting opening 201.

[0020] Specifically, as shown in FIG. 1, a circular first mounting opening 201 is provided at the front end of the rear grille 200, the front grille 100 is attached to the first mounting opening 201 in a detachable manner, and there is no need to distinguish between the front and back of the front grille 100 when attaching it, and the multiple air ducts 101 provided on the front grille 100 are distributed at intervals within the same circumference, and the airflow directions at the openings at both ends of the air duct 101 are parallel to the central axis of the first mounting opening 201 and intersect at obtuse angles along the central axis of the first mounting opening 201.

[0021] In this embodiment, the front grille 100 of the fan hood structure is detachably mounted to the first mounting opening 201, and the opposite sides of the front grille 100 can be selectively directed toward the rear grille 200. That is, the front grille 100 can be mounted on both sides, and can be mounted and detached regardless of the mounting direction. Secondly, the plurality of air ducts 101 of the front grille 100 are spaced apart on the same circumference. The airflow movement direction at one end opening of the air duct 101 is parallel to the central axis direction of the first mounting opening 201, so that the opening at this end faces the grille. When positioned in front of the structure, the grille structure can direct airflow in a straight line in the axial direction, as shown in FIG. 2; when the airflow movement direction at the outlet of the other end of the air duct 101 intersects with the central axis of the first mounting port 201 and the opening at this end is positioned in front of the grille structure, the grille structure can direct airflow in a diffusive direction in a non-axial direction, as shown in FIG. 3. In summary, the fan hood structure of the present invention breaks the limitation of the related art that the front grille 100 is limited to direct airflow in an axial direction, thereby enriching the air flow modes and further improving the user experience.

[0022] Optionally, at least a portion of the front grille 100 is located within the first mounting opening 201 and is removably connected to the rear grille 200 .

[0023] Specifically, as shown in Figures 2 and 3, the entire front grille 100 is positioned within the first mounting opening 201 and is removably connected to the rear grille 200, and the circumferential side walls of the front grille 100 are attached to the inner walls of the first mounting opening 201.

[0024] In other embodiments, the front grille 100 may be partially located within the first mounting opening 201, which is not limited here and is determined according to actual needs.

[0025] Optionally, the front grille 100 includes an outer frame 104, and a second mounting opening 102 and a third mounting opening 103 are provided at both ends of the outer frame 104 along its axial direction, respectively, and the portion of the rear grille 200 provided with the first mounting opening 201 is inserted into the second mounting opening 102 or the third mounting opening 103 of the front grille 100 and is removably connected to the rear grille 200.

[0026] Specifically, as shown in FIG. 4, a second mounting opening 102 and a third mounting opening 103 are provided at both ends of the outer frame 104 along its axial direction, a lattice structure is attached within the outer frame 104, and an air duct 101 is formed in the lattice structure, the second mounting opening 102 and the third mounting opening 103 have the same shape and dimensions, and are arranged symmetrically with respect to the air duct 101 of the front grille 100, and as shown in FIG. 5, when the front grille 100 is attached to the rear grille 200, the front end of the rear grille 200 is inserted into the second mounting opening 102 or the third mounting opening 103 of the front grille 100 and is detachably connected to the rear grille 200, and the inner wall of the second mounting opening 102 or the third mounting opening 103 is bonded to the outer wall of the front end of the rear grille 200.

[0027] Optionally, the fan hood structure further includes a first connecting structure and a second connecting structure, the first connecting structure being provided on the periphery of the front grille 100 and the second connecting structure being provided on the periphery of the rear grille 200, and the first connecting structure and the second connecting structure being used for rotational engagement, thereby connecting the front grille 100 and the rear grille 200.

[0028] In this optional embodiment, the first and second connecting structures of the fan hood structure are engaged by rotary engagement, allowing for tool-free installation and removal with simple steps. This not only greatly improves the efficiency of installation and removal of the front grille 100 and rear grille 200, but also forms a circumferential engagement stopper, reinforcing connection stability and preventing the fan hood structure from loosening when the fan is operating.

[0029] Optionally, the front grille 100 and the rear grille 200 are connected by a plurality of sets of first connecting structures and second connecting structures, and the plurality of sets of first connecting structures and second connecting structures are uniformly distributed.

[0030] Specifically, as shown in FIG. 1, one first connection structure and one second connection structure form one set, and the front grille 100 and the rear grille 200 are connected by multiple sets of first connection structures and second connection structures located within the same circumference.

[0031] In this optional embodiment, the front grille 100 and the rear grille 200 are connected by multiple sets of evenly distributed first connecting structures and second connecting structures, which can uniformly distribute the acting force along the circumference, avoiding structural deformation or damage caused by excessive local force bearing, and further improving the structural strength of the entire fan hood structure.

[0032] Optionally, when at least a portion of the front grille 100 is located within the first mounting hole 201 and is detachably connected to the rear grille 200, the outer shape of the front grille 100 is circular, the first connecting structure is a first fixing groove 300 provided on a circumferential side wall of the front grille 100, the first fixing groove 300 includes a first groove unit 301 and a second groove unit 302, and the first groove unit 301 extends along the thickness direction of the front grille 100; One end of the second groove unit 302 is connected to the first groove unit 301, and the other end extends along the circumferential direction of the front grille 100. The second connecting structure is a first protrusion 400 provided on the inner wall of the first mounting opening 201. The first protrusion 400 passes through the first groove unit 301 to reach the connecting point between the first groove unit 301 and the second groove unit 302, and is used to engage into the second groove unit 302 when the front grille 100 and the rear grille 200 rotate relative to each other.

[0033] Specifically, the number of the first fixing grooves 300 may be one, two, three, etc., and is not particularly limited here and can be determined according to actual needs. At the same time, the first fixing groove 300 may have at least one second groove unit 302 on one side of the first groove unit 301 in the extension direction, or at least one second groove unit 302 on each side of the first groove unit 301 in the extension direction.

[0034] As shown in the figure, the first groove unit 301 extends along the thickness direction of the front grille 100, thereby forming entrances on the front and rear end faces of the outer frame 104 of the front grille 100, which allow the first protrusion 400 to enter and exit the first groove unit 301. One end of the second groove unit 302 is connected to the middle position of the first groove unit 301, and the other end extends along the circumferential direction of the front grille 100. When installed, the first protrusion 400 first passes through the entrance of the first groove unit 301 and reaches the connection point between the first groove unit 301 and the second groove unit 302, and then engages into the second groove unit 302 as the front grille 100 and the rear grille 200 rotate relative to each other, continuing until the front grille 100 and the rear grille 200 can no longer rotate relative to each other, thereby realizing axial and radial positional control of the front grille 100 and the rear grille 200.

[0035] In this optional embodiment, the outer shape of the front grille 100 is circular, and is combined with the engagement structure of the first fixing groove 300 and the first protrusion 400 of the "first groove unit 301 + second groove unit 302." The first protrusion 400 is inserted along the entrance of the first groove unit 301, and then rotated and engaged with the second groove unit 302, thereby realizing quick installation and removal, thereby meeting the requirement of double-sided installation of the front grille 100. At the same time, the evenly distributed multiple sets of this structure further balance the circumferential force bearing of the fan hood structure, achieving both convenience of installation and removal, flexibility of installation, and stable connection.

[0036] Optionally, when the portion of the rear grille 200 provided with the first mounting hole 201 is inserted into the second mounting hole 102 or the third mounting hole 103 of the front grille 100 and is detachably connected to the rear grille 200, the outer shape of the portion of the rear grille 200 provided with the first mounting hole 201 is circular, the first connecting structure is a second protrusion 500 provided on the inner wall of the second mounting hole 102 or the third mounting hole 103, the second connecting structure is a second fixing groove 600 provided on the circumferential side wall of the rear grille 200, and the second fixing groove 600 is connected to a third groove unit 601 and a fourth groove unit 602. The front grille 100 includes a third groove unit 601 extending along the central axis of the first mounting hole 201, with one end of the third groove unit 601 extending to the edge of the first mounting hole 201, one end of the fourth groove unit 602 communicating with the third groove unit 601 and the other end extending along the circumferential direction of the circumferential side wall of the rear grille 200, and the second protrusion 500 passing through the third groove unit 601 reaches the connecting point between the third groove unit 601 and the fourth groove unit 602, and is used to engage into the fourth groove unit 602 when the front grille 100 and the rear grille 200 rotate relative to each other.

[0037] Specifically, the number of the second fixing grooves 600 may be one, two, three, etc., and is not limited here and can be determined according to actual needs. At the same time, the second fixing groove 600 may have at least one fourth groove unit 602 on one side of the third groove unit 601 in the extension direction, or at least one fourth groove unit 602 on each side of the third groove unit 601 in the extension direction.

[0038] As shown in FIG. 4 , the third groove unit 601 is provided on the inner wall of the first mounting hole 201 and extends along the central axis of the first mounting hole 201 to the edge of the first mounting hole 201, thereby forming an inlet at the edge of the first mounting hole 201, which allows the second protrusion 500 to enter or exit the third groove unit 601. One end of the fourth groove unit 602 is connected to one end of the third groove unit 601 that is away from the edge of the first mounting hole 201, and the other end is connected to the rear grille 200. The second protrusion 500 extends circumferentially along the circumferential side wall, and when installed, the second protrusion 500 first passes through the third groove unit 601 and reaches the connecting point between the third groove unit 601 and the fourth groove unit 602, and then engages with the fourth groove unit 602 as the front grille 100 and the rear grille 200 rotate relative to each other, continuing until the front grille 100 and the rear grille 200 can no longer rotate relative to each other, thereby realizing axial and radial positional regulation of the front grille 100 and the rear grille 200.

[0039] In this optional embodiment, the outer shape of the part of the rear grille 200 where the first mounting hole 201 is provided is circular. Combined with the engagement structure of the second fixing groove 600 and the second protrusion 500 of the "third groove unit 601 + fourth groove unit 602", the circular outline not only ensures concentricity when the front grille 100 is fitted through the second mounting hole 102 or the third mounting hole 103, but also allows the second protrusion 500 to be inserted along the third groove unit 601 and then rotated and engaged with the fourth groove unit 602, enabling quick installation and removal.

[0040] Optionally, one end of the air duct 101 is a straight duct section, and the air flow movement direction of the straight duct section is parallel to the central axis direction of the first mounting port 201, and the other end of the air duct 101 is an arc-shaped duct section or an inclined duct section arranged at an angle to the straight duct section, and the air flow movement direction of the arc-shaped duct section and the inclined duct section intersects with the central axis direction of the first mounting port 201.

[0041] Specifically, one end of the air duct 101 is a straight duct section and the other end is an arc-shaped duct section; when the straight duct section is located at the front of the fan hood structure, the airflow movement direction of the straight duct section is parallel to the central axis of the first mounting port 201 and is used for axial linear airflow; when the arc-shaped duct section is located at the front of the fan hood structure, the airflow movement direction of the arc-shaped duct section intersects with the central axis of the first mounting port 201 and is used for non-axial diffused airflow.

[0042] In other embodiments, the other end of the air duct 101 may be an inclined duct section that is inclined relative to the straight duct section, and is not particularly limited here and is determined according to actual needs.

[0043] Optionally, the front grille 100 includes a plurality of partition plates 700 distributed at intervals within the same circumference, and an air duct 101 is formed between two adjacent partition plates 700, and the partition plates 700 include a first plate member 701 and a second plate member 702 connected along the central axis direction of the first mounting port 201, and the first plate member 701 is a straight plate, and the second plate member 702 is an arc-shaped plate or a straight plate arranged to form an included angle with the first plate member 701.

[0044] Specifically, the number of partition plates 700 is not particularly limited and can be determined according to actual needs. As shown in Fig. 1, the partition plates 700 of the front grille 100 are spaced apart on the same circumference, and the space between two adjacent partition plates 700 forms an air duct 101. In the structure of a single partition plate 700, a first plate member 701 and a second plate member 702 are connected along the central axis of the first mounting hole 201, of which the first plate member 701 is a straight plate and the second plate member 702 is an arc-shaped plate.

[0045] In other embodiments, the second plate member 702 may be a straight plate arranged to form an included angle with the first plate member 701, and is not particularly limited here and can be determined according to actual needs.

[0046] Optionally, the front grille 100 is provided with a plurality of circumferential storage spaces along the radial direction, and each of the circumferential storage spaces has a plurality of air ducts 101 distributed at intervals along the same circumference.

[0047] Specifically, the number of storage spaces is not particularly limited and can be determined according to actual needs, and two adjacent storage spaces are separated by a common ring. As shown in Fig. 1, the front grille 100 has two storage spaces arranged along the radial direction, and each storage space has a plurality of partition plates 700 distributed at intervals along the same circumference, and the plurality of partition plates 700 are connected to the corresponding rings and form a plurality of air ducts 101.

[0048] In this optional embodiment, the front grille 100 is provided with multiple radially arranged storage spaces, and multiple air ducts 101 are uniformly arranged on each periphery, forming a stable structure that combines a multi-chamber and a grid. This allows the stress caused by the vibration load and airflow impact during fan operation to be uniformly distributed along the multiple periphery structure, avoiding deformation or damage of a single periphery duct due to local stress concentration. At the same time, the storage spaces and ducts arranged on multiple peripheries form a mechanical structure that supports each other, thereby improving the bending resistance and structural rigidity of the entire front grille 100.

[0049] The fan according to the embodiment of the present invention includes the above-mentioned fan hood structure, as shown in FIGS.

[0050] The fan of this embodiment has the same beneficial effects as the fan hood structure described above in relation to the related art, and therefore a description thereof will be omitted here.

[0051] Although the present invention has been disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications are included in the scope of protection of the present invention. [Explanation of symbols]

[0052] 100, front grille, 101, air duct, 102, second mounting port, 103, third mounting port, 104, outer frame, 200, rear grille, 201, first mounting port, 300, first fixing groove, 301, first groove unit, 302, second groove unit, 400, first protrusion, 500, second protrusion, 600, second fixing groove, 601, third groove unit, 602, fourth groove unit, 700, partition plate, 701, first plate member, 702, second plate member.

Claims

1. a fan hood structure including a front grille (100) and a rear grille (200), the rear grille (200) having a first mounting opening (201), the front grille (100) being adapted to be detachably attached to the first mounting opening (201), opposite side surfaces of the front grille (100) selectively facing the rear grille (200), the front grille (100) being provided with a plurality of air ducts (101) penetrating both opposite side surfaces thereof, the plurality of air ducts (101) being distributed at intervals within the same circumference, the direction of airflow movement at an opening at one end of the air duct (101) along a central axis direction of the first mounting opening (201) being parallel to the central axis direction of the first mounting opening (201), and the direction of airflow movement at an opening at the other end of the air duct (101) intersecting the central axis direction of the first mounting opening (201).

2. At least a portion of the front grille (100) is located within the first mounting opening (201) and is removably connected to the rear grille (200); Alternatively, the front grille (100) includes an outer frame (104), and a second mounting opening (102) and a third mounting opening (103) are provided at both ends of the outer frame (104) along its axial direction, respectively, and the portion of the rear grille (200) provided with the first mounting opening (201) is inserted into the second mounting opening (102) or the third mounting opening (103) of the front grille (100) and is removably connected to the rear grille (200).

3. 3. The fan hood structure of claim 2, further comprising a first connection structure and a second connection structure, wherein the first connection structure is provided on the periphery of the front grille (100) and the second connection structure is provided on the periphery of the rear grille (200), and the first connection structure and the second connection structure are used for rotational engagement, thereby connecting the front grille (100) and the rear grille (200).

4. 4. The fan hood structure of claim 3, wherein the front grille (100) and the rear grille (200) are connected by a plurality of sets of the first connecting structures and the second connecting structures, and the plurality of sets of the first connecting structures and the second connecting structures are uniformly distributed.

5. When at least a portion of the front grille (100) is located within the first mounting opening (201) and is detachably connected to the rear grille (200), the outer shape of the front grille (100) is circular; The first connecting structure is a first fixing groove (300) provided on a circumferential side wall of the front grille (100), the first fixing groove (300) including a first groove unit (301) and a second groove unit (302), the first groove unit (301) extending along the thickness direction of the front grille (100), one end of the second groove unit (302) communicating with the first groove unit (301) and the other end extending along the circumferential direction of the front grille (100), 4. The fan hood structure of claim 3, wherein the second connection structure is a first protrusion (400) provided on the inner wall of the first mounting opening (201), the first protrusion (400) passes through the first groove unit (301) to reach the connecting point between the first groove unit (301) and the second groove unit (302), and is used to engage into the second groove unit (302) when the front grille (100) and the rear grille (200) rotate relative to each other.

6. When the portion of the rear grille (200) provided with the first mounting opening (201) is inserted into the second mounting opening (102) or the third mounting opening (103) of the front grille (100) and is detachably connected to the rear grille (200), the outer shape of the portion of the rear grille (200) provided with the first mounting opening (201) is circular; The first connecting structure is a second protrusion (500) provided on the inner wall of the second mounting opening (102) or the third mounting opening (103), and the second connecting structure is a second fixing groove (600) provided on the circumferential side wall of the rear grille (200), the second fixing groove (600) includes a third groove unit (601) and a fourth groove unit (602), the third groove unit (601) extends along the central axis direction of the first mounting opening (201), and one end of the third groove unit (601) extends to the edge of the first mounting opening (201).

4. The fan hood structure of claim 3, wherein one end of the fourth groove unit (602) is connected to the third groove unit (601) and the other end is extended circumferentially along the circumferential side wall of the rear grille (200), and the second protrusion (500) passes through the third groove unit (601) to reach a connecting point between the third groove unit (601) and the fourth groove unit (602), and is used to engage into the fourth groove unit (602) when the front grille (100) and the rear grille (200) rotate relative to each other.

7. 2. The fan hood structure of claim 1, wherein one end of the airflow duct (101) is a straight duct portion, the airflow movement direction of the straight duct portion is parallel to the central axis direction of the first mounting opening (201), and the other end of the airflow duct (101) is an arc-shaped duct portion or an inclined duct portion that is inclined relative to the straight duct portion, and the airflow movement direction of the arc-shaped duct portion and the inclined duct portion intersects with the central axis direction of the first mounting opening (201).

8. 2. The fan hood structure of claim 1, wherein the front grille (100) includes a plurality of partition plates (700) distributed at intervals on the same circumference, the partition plates (700) forming the air duct (101) between two adjacent partition plates (700), the partition plates (700) including a first plate member (701) and a second plate member (702) connected along the central axis direction of the first mounting opening (201), the first plate member (701) being a straight plate, and the second plate member (702) being an arc-shaped plate or a straight plate arranged so as to form an included angle with the first plate member (701).

9. 2. The fan hood structure according to claim 1, wherein the front grille (100) has a plurality of radially arranged storage spaces, and the plurality of air ducts (101) are distributed at intervals along the same circumference within each of the storage spaces.

10. A fan comprising the fan hood structure according to any one of claims 1 to 9.

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